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Zygomatic Arches

Zygomatic Arches. Week 8. Zygomatic Arches: Anatomy. Prominent process called Zygomatic process Squamous portion of temporal bone: Projects anteriorly Articulates with zygoma. Common Projections for Zygomatic Arches. SMV Tangential: oblique inferosuperior Modified Towne: AP Axial.

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Zygomatic Arches

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  1. Zygomatic Arches Week 8

  2. Zygomatic Arches: Anatomy • Prominent process called Zygomatic process • Squamous portion of temporal bone: • Projects anteriorly • Articulates with zygoma

  3. Common Projections for Zygomatic Arches • SMV • Tangential: oblique inferosuperior • Modified Towne: AP Axial

  4. Indications • Fractures • Trauma • Neoplastic / inflammatory processes

  5. LeFort Fractures

  6. Isolated Zygomatic Arches

  7. Isolated Zygomatic Arch Fractures

  8. SMV for Zygomatic Arches • Seated or supine • IOML parallel with IR • MSP perpendicular • If supine: • Flex knees • Elevate trunk for full neck extension • Relax abdomen • CR perp to IOML and entering 1” posterior to outer canthi

  9. SMV Radiographfor Zygomatic Arches • Zygomatic arches free from overlying structures • No rotation as indicated by symmetric arches w/o foreshortening • Mandibular symphysis SI frontal bone

  10. Tangential Projection forZygomatic arches • Seated or supine • IOML parallel with IR • MSP 15 degrees toward side being examined • Tilt vertex 15 degrees away from side being examined • CR perp to IOML and centered to arch at a point 1” posterior to outer canthus

  11. Tangential Anatomy

  12. Tangential Radiograph for Zygomatic arches • Zygomatic arch free from overlying structures • Zygomatic arch not overexposed • Collimate tightly

  13. Modified Towne: AP Axialfor Zygomatic Arches • Seated or supine • MSP & OML perpendicular • CR to enter glabella approx 1” above nasion • OML: 30 caudad • IOML 37 caudad

  14. Modified Towne Anatomy

  15. Modified Towne Radiograph for Zygomatic Arches • No overlap of zygomatic arches by mandible • No rotation as evident by symmetric arches • Arches projected lateral to mandibular rami

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